Applying and removing extension device for temporary rivets



F. L. GRAHAM 2,601,117

APPLYING AND REMOVING EXTENSION DEVICE FOR TEMPORARY RIVETS June 17,1952 Filed May 13, 1949 I INVENTOR. FRANK L. GRAHAM ATTORNEYS PatentedJune 17, 1952 APPLYING AND REMOVING EXTENSION DEVICE FOR TEMPORARYRIVETS Frank ah m, en Fran s-tor Calit Application May 13, 1949, SerialNo. 93,107-

2 l ms:

This invention relates to hand manipulable tools, and more particularlyto an applying and removing extension device for temporary rivets usedin holding together perforated sheets, or perforated sheets and strutswith their perfora: tions in alignment, preparatory to riveting them orthe like,

Temporary rivets of this character are on the market and have long beenused for the purpose specified. Examples of rivets of this type areshown in. United States Patents 2,136,875, granted November 15, 1938,2,159,655, granted May 23, 1939, and 2,266,929, granted December 23,1941. Those most commonly used in the United States each comprises atubular body for engagement with one face of the perforated plates, thebody having an enlargement providing a circumfer: ential shoulderadapted to be engaged by the bifurcated jaw of a plierelike hand toolshown in said Patent 2,136,875.; a detent means. carried by the body andextending from one end thereof, to be engaged with the opposite face ofthe other perforated plate; and a spring operated plunger reciprocablein the tubular body for op-. erating the detent means, this plungerbeing enaged by the other jaw of the hand tool when placing or removingthe rivet.

This combination of temporary rivet and hand tool has been found verysatisfactory for general use, the plierelike tool being inexpensive,comparatively light in weight, and efficient in operation when the zoneswhere the rivets are to be placed or removed, are at arms length, orless, from those places accessible to the workmen.

In a'large part of Work, especially aircraft repair, this arms lengthlimit of operation means inaccessibility and often involves theexpenditure of hundreds of dollars and many man-hours labor just toremove obstructions or tear into ships from the outside to reachrestricted areas and permit workmen to reach the repair job. In additionto this, costly equipment, such as aircraft, is laid-up for aconsiderable length of time while the tearing down and reconditioning istaking place.

The principal object of this invention is to provide an extension devicewhich may be easily and quickly used with these types of temporaryrivets and hand tools of the general nature referred to, whereby therivets may be placed a r removed without t expense d de a above r fer edto if the zon r coeraticn is. out f arms each.

An ther object is to provide extensi devices of the character described,which are low in cost of manufacture and. which may be made in var:ious. lengths to satisfy the requirements in VQI'. ious types offactories and repair shops or staev tions.

Other objects and advantages will appear n (or. 29m283.)

he foll wing detaeecrl' scrihtien o a i hl t sfaetorv ens or; invent ontaken n co ne ion, 1 t e-aqeemhehvms: r w n rmin a ar o this sn eifica ein ch 5 rawin Pie, a ide els atiohe v h e noh devis s. 2 is an. e la edfra me a deta View,

' and par y er cal s o de s to whit it hand tool of the plierlike type,and temporary rivet in readiness to be placed. retainin relationsh p owo pe or ed. plat s:

F g, 3 is a simi ar view on a lar er scale. partvfront e va and ar in rc i n, sh w n detent means oi h rivet x ding through the perforations ofthe plates,

h s, s is a f agment ry h shee ive iew o one end p rt on or the,extension. bod po i n- In he d awi. A desi nates th e tens d vice, B asuita e h nd tool of the p ierrlike ype. C.- a suitab e t pe f tempor ryr et; wh h ma be used with the ex n on. devi e and. plates to h h o etheby the iv t. G-

The hand too o d in the a t i hown h ur prising two pivotally connectedlevers ii and 5,. a jaw 6 of lever 4. bein bi urcated a at and a jaw 8of lever 5. having a socket 9 for engage.- ment with a part of" therivet C.

The rivet is shown a omprisin 3 91 tubula body It havin chromi eentendin flan or enlar eme H p idin shoulder I2, which is. norma ly n a edlay th bifurcated end 1 or the hand o a when the hand t ol is app ieddirect to th ivet; detent means I3 extending from on th Qi r I; and asprin operated plun er rfisi r eble in the body I for operatin thedetent means in any suitable or approved manner, the plunger L4 normallyextending from the ot er 6 1 body In. In practice, when the hand t ol 3is in direct operative relation to the rivet, the upper end of pioneerL4 i receiv d in the Socket 9 fiaw 8, and, th law 6 is arran ed in emb aing relation to the body H! and n em w oulder 12. Upon movin the ev rsI} and 5 toward each other the plunger 14 is de pressed and the detentmeans 13 is projected so that it may be inserted through perforations ISin plates D, with the, end of the body It engaging the face of one ofthe plates. When the plunger 14 is permitted to resume its. normalposition, by relieving pressure on the lever and 5 of the hand tool B,the detent means it fume ly engages the race of the other plate.

Referring now to the extension device A, it comprises a hollow rod 1 anda plunger r ll reciprocable therein.

The hollow rod comprises a relatively long tubular body l8 andrelatively short reduced end portions [9 and 20. The end portion I9 isconstructed and arranged to function as a coupling means for detachableconnection with the rivet C and in the example shown is made by reducingthe cross section of the stock from which body I8 is made by cuttingaway laterally, preferably less than one half thereof, leaving stock 2|of substantially U-shaped cross section, so that the rivet may bereceived in the extension device laterally of its axis. The stock 2! isprovided with longitudinally spaced, circumferentially extending slits22 and 23 at each side, providing arms 24 and 25 extending from eachside of a bight portion 26 as shown in Fig. 4. The arms 24 are bent to apermanently set position to diverge outwardly from the bight portion, soas to accommodate the enlargement ll of the rivet C. The arms 25 thusprovide shoulders 21 for engagement with the shoulder l2 and alsoembrace the body H] of the rivet C when it is forced laterally in placewith the axis of plunger I4 in substantially axial alignment with theaxis of hollow rod IS. The end portion 20 is reduced in diameter toprovide a collar-like formation 29 providing an internal annularshoulder 30 facing toward the end portion I9, and is provided with anexternal flange 3| at its free end portion providing a shoulder 32 alsofacing toward the end portion l9. Thus the collar-like formationaccommodates the bifurcated jaw T of the hand tool B with its armsengaging the shoulder 32 as shown in Fig. 2.

The plunger rod I6 is, in the example shown, made from rod stock andturned or otherwise treated to comprise a relatively long body portion34 and a relatively short reduced end portion 35 providing a shoulder36. The portion 34 is of a length to extend from adjacent the junctureof end portion [9 of the hollow rod l6, when the plunger rod isassembled to extend therein, to adjacent the shoulder 30, and theportion 35 extends through the reduced end portion 20 of hollow rod IEto a point beyond the free end of such portion 20, as shown in Fig. 1.If desired the other end of rod 17 may also be slightly reduced indiameter to provide a relatively short end portion 36 to enter the bodyportion of temporary rivets of the type shown in the aforesaid-Patent2,159,655, where the spring operated plunger does not extend beyond theend of the rivet body.

The shoulders 30 and 36 prevent the plunger rod l I from being withdrawnfrom the hollow rod 16 at the end portion 20 of the latter, and theplunger rod I! may have a snug fit in the hollow rod 16, so that it willnot readily slide from the latter at its end portion I9 if held in theposition shown in Figs. 1 and 2.

The operation of the extension device A is as simple as itsconstruction. The rivet C is pressed into the coupling portion 19 whereit is firmly gripped. The hand tool B is then applied to the end portion'20 and pressure applied to the levers 4 and in the usual way. Thus theplunger rod I1 operates the plunger I4 of the rivet to condition thedetent means [3 for insertion through the perforations 15 of the platesD. Releasing pressure on the levers 4 and 5 results in firm grippingrelation of the work by the rivet, and disengagement of the extensiondevice from the rivet requires only a light tipping and lateral pressureapplied to the extension device. Removal of the rivet is just as simple,the procedure being the reverse of that described for placing the rivet.

While I have herein referred to the unit C as a temporary rivet it is tobe understood that this unit, sometimes referred to as a sheet metalfastener, coupling, clamp device, etc. may of course be placed to holdparts together and left in place, if access cannot readily be had to thezone for the substitution of ordinary rivets, bolts, screws and thelike.

I claim:

1. An extension device for applying and removing temporary rivets,comprising a hollow rod having a relatively long tubular body portion,and relatively short first and second reduced end portions, said firstend portion being of substantially U-shaped cross section adapted toreceive the rivet laterally of the axis of said rod and being providedwith resilient arms for embracing relationship with the rivet, and saidsecond reduced end portion of collar-like formation providing aninternal annular shoulder facing toward said first end portion, andbeing provided with an external flange at its free end portion providinga shoulder facing toward said first end portion; and a plunger rodreciprocable in said hollow rod, said plunger rod having a relativelylong body portion extending from adjacent said first end portion toadjacent said shoulder of the hollow rod, and a relatively short reducedportion extending through said second reduced end portion of the hollowrod and to a point beyond the free end of said last mentioned endportion.

2. An extension device for applying'and removing temporary rivets,comprising a hollow rod having a relatively long tubular body portionand two end portions, one end portion being a relatively short reducedend portion of substantially U-shaped cross section adapted to receivethe rivet laterally of the axis of said rod, and being provided with abight portion and resilient arms intermediate the length of said reducedend portion and diverging outwardly from said bight portion and havingside faces, for embracing relationship with a portion of the rivet, saidbight portion having a pair of shoulders facing toward said side facesfor abutting another portion of said rivet, the other end portion beingof collar-like formation providing an internal annular shoulder facingtoward said one end portion and having an external flange providing ashoulder facing toward said one end portion, and a plunger rodreciprocable in said hollow rod, said plunger extending with one endthereof at a point in said hollow rod inwardly of said arms to a pointbeyond the other end of the hollow rod and through said other endportion, said plunger having an external shoulder engageable with saidinternal shoulder.

FRANK L. GRAHAM.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 900,337 Wingate Oct. 6, 19081,111,380 Hanke Sept. 22, 1914 1,478,555 Dahm Dec. 25, 1923 1,552,087Smith Sept. 1, 1925 1,607,929 Waters Nov. 23, 1926 2,136,875 Blanc Nov.15, 1938 2,328,866 Van Sittert et al. Sept. 7, 1943 2,365,787 WallaceDec. 26, 1944' 2,339,397 Helbus'h Jan. 18, 1944 2,357,207 Kost -1 Aug.29, 1944

